<?php

    /**
     * PHPExcel_Writer_Excel2007_WriterPart
     * Copyright (c) 2006 - 2015 PHPExcel
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Lesser General Public
     * License as published by the Free Software Foundation; either
     * version 2.1 of the License, or (at your option) any later version.
     * This library is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * Lesser General Public License for more details.
     * You should have received a copy of the GNU Lesser General Public
     * License along with this library; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     * @category   PHPExcel
     * @package    PHPExcel_Writer_Excel2007
     * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
     * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
     * @version    ##VERSION##, ##DATE##
     */
    abstract class PHPExcel_Writer_Excel2007_WriterPart {
        /**
         * Parent IWriter object
         * @var PHPExcel_Writer_IWriter
         */
        private $parentWriter;

        /**
         * Set parent IWriter object
         * @param PHPExcel_Writer_IWriter $pWriter
         * @throws PHPExcel_Writer_Exception
         */
        public function __construct(PHPExcel_Writer_IWriter $pWriter = null) {
            if (!is_null($pWriter)) {
                $this->parentWriter = $pWriter;
            }
        }

        /**
         * Get parent IWriter object
         * @return PHPExcel_Writer_IWriter
         * @throws PHPExcel_Writer_Exception
         */
        public function getParentWriter() {
            if (!is_null($this->parentWriter)) {
                return $this->parentWriter;
            } else {
                throw new PHPExcel_Writer_Exception("No parent PHPExcel_Writer_IWriter assigned.");
            }
        }

        /**
         * Set parent IWriter object
         * @param PHPExcel_Writer_IWriter $pWriter
         * @throws PHPExcel_Writer_Exception
         */
        public function setParentWriter(PHPExcel_Writer_IWriter $pWriter = null) {
            $this->parentWriter = $pWriter;
        }
    }
